a6e50b409d
If we write a full chunk in the snapshot, skip reading the origin device
because the whole chunk will be overwritten anyway.
This patch changes the snapshot write logic when a full chunk is written.
In this case:
1. allocate the exception
2. dispatch the bio (but don't report the bio completion to device mapper)
3. write the exception record
4. report bio completed
Callbacks must be done through the kcopyd thread, because callbacks must not
race with each other. So we create two new functions:
dm_kcopyd_prepare_callback: allocate a job structure and prepare the callback.
(This function must not be called from interrupt context.)
dm_kcopyd_do_callback: submit callback.
(This function may be called from interrupt context.)
Performance test (on snapshots with 4k chunk size):
without the patch:
non-direct-io sequential write (dd): 17.7MB/s
direct-io sequential write (dd): 20.9MB/s
non-direct-io random write (mkfs.ext2): 0.44s
with the patch:
non-direct-io sequential write (dd): 26.5MB/s
direct-io sequential write (dd): 33.2MB/s
non-direct-io random write (mkfs.ext2): 0.27s
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/*
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* Copyright (C) 2001 - 2003 Sistina Software
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* Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved.
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*
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* kcopyd provides a simple interface for copying an area of one
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* block-device to one or more other block-devices, either synchronous
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* or with an asynchronous completion notification.
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*
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* This file is released under the GPL.
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*/
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#ifndef _LINUX_DM_KCOPYD_H
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#define _LINUX_DM_KCOPYD_H
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#ifdef __KERNEL__
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#include <linux/dm-io.h>
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/* FIXME: make this configurable */
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#define DM_KCOPYD_MAX_REGIONS 8
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#define DM_KCOPYD_IGNORE_ERROR 1
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/*
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* To use kcopyd you must first create a dm_kcopyd_client object.
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*/
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struct dm_kcopyd_client;
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struct dm_kcopyd_client *dm_kcopyd_client_create(void);
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void dm_kcopyd_client_destroy(struct dm_kcopyd_client *kc);
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/*
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* Submit a copy job to kcopyd. This is built on top of the
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* previous three fns.
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*
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* read_err is a boolean,
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* write_err is a bitset, with 1 bit for each destination region
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*/
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typedef void (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err,
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void *context);
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int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
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unsigned num_dests, struct dm_io_region *dests,
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unsigned flags, dm_kcopyd_notify_fn fn, void *context);
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/*
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* Prepare a callback and submit it via the kcopyd thread.
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*
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* dm_kcopyd_prepare_callback allocates a callback structure and returns it.
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* It must not be called from interrupt context.
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* The returned value should be passed into dm_kcopyd_do_callback.
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*
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* dm_kcopyd_do_callback submits the callback.
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* It may be called from interrupt context.
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* The callback is issued from the kcopyd thread.
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*/
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void *dm_kcopyd_prepare_callback(struct dm_kcopyd_client *kc,
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dm_kcopyd_notify_fn fn, void *context);
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void dm_kcopyd_do_callback(void *job, int read_err, unsigned long write_err);
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#endif /* __KERNEL__ */
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#endif /* _LINUX_DM_KCOPYD_H */
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